private void GetRootFrnEntry() { string driveRoot = string.Concat("\\\\.\\", _drive); driveRoot = string.Concat(driveRoot, Path.DirectorySeparatorChar); IntPtr hRoot = PInvokeWin32.CreateFile(driveRoot, 0, PInvokeWin32.FILE_SHARE_READ | PInvokeWin32.FILE_SHARE_WRITE, IntPtr.Zero, PInvokeWin32.OPEN_EXISTING, PInvokeWin32.FILE_FLAG_BACKUP_SEMANTICS, IntPtr.Zero); if (hRoot.ToInt32() != PInvokeWin32.INVALID_HANDLE_VALUE) { PInvokeWin32.BY_HANDLE_FILE_INFORMATION fi = new PInvokeWin32.BY_HANDLE_FILE_INFORMATION(); bool bRtn = PInvokeWin32.GetFileInformationByHandle(hRoot, out fi); if (bRtn) { UInt64 fileIndexHigh = (UInt64)fi.FileIndexHigh; UInt64 indexRoot = (fileIndexHigh << 32) | fi.FileIndexLow; FileNameAndParentFrn f = new FileNameAndParentFrn(driveRoot, 0); _directories.Add(indexRoot, f); } else { throw new IOException("GetFileInformationbyHandle() returned invalid handle", new Win32Exception(Marshal.GetLastWin32Error())); } PInvokeWin32.CloseHandle(hRoot); } else { throw new IOException("Unable to get root frn entry", new Win32Exception(Marshal.GetLastWin32Error())); } }
unsafe public void EnumerateFiles(IntPtr medBuffer, ref Dictionary <ulong, FileNameAndParentFrn> files, string[] fileExtensions) { IntPtr pData = Marshal.AllocHGlobal(sizeof(UInt64) + 0x10000); PInvokeWin32.ZeroMemory(pData, sizeof(UInt64) + 0x10000); uint outBytesReturned = 0; uint initfiles = 0; uint totalfiles = 3000; while (false != PInvokeWin32.DeviceIoControl(_changeJournalRootHandle, PInvokeWin32.FSCTL_ENUM_USN_DATA, medBuffer, sizeof(PInvokeWin32.MFT_ENUM_DATA), pData, sizeof(UInt64) + 0x10000, out outBytesReturned, IntPtr.Zero)) { IntPtr pUsnRecord = new IntPtr(pData.ToInt32() + sizeof(Int64)); while (outBytesReturned > 60) { PInvokeWin32.USN_RECORD usn = new PInvokeWin32.USN_RECORD(pUsnRecord); if (0 != (usn.FileAttributes & PInvokeWin32.FILE_ATTRIBUTE_DIRECTORY)) { // // handle directories // if (!_directories.ContainsKey(usn.FileReferenceNumber)) { _directories.Add(usn.FileReferenceNumber, new FileNameAndParentFrn(usn.FileName, usn.FileReferenceNumber)); } else { // this is debug code and should be removed when we are certain that // duplicate frn's don't exist on a given drive. To date, this exception has // never been thrown. Removing this code improves performance.... throw new Exception(string.Format("Duplicate FRN: {0} for {1}", usn.FileReferenceNumber, usn.FileName)); } } else { // if (initfiles > 3000) // break; // // handle files // // at this point we could get the * for the extension bool add = true; bool fullpath = false; if (fileExtensions != null && fileExtensions.Length != 0) { if (fileExtensions[0].ToString() == "*") { add = true; fullpath = true; } else { add = false; string s = Path.GetExtension(usn.FileName); foreach (string extension in fileExtensions) { if (0 == string.Compare(s, extension, true)) { add = true; break; } } } } if (add) { if (fullpath) { if (!files.ContainsKey(usn.FileReferenceNumber)) { initfiles++; files.Add(usn.FileReferenceNumber, new FileNameAndParentFrn(usn.FileName, usn.ParentFileReferenceNumber)); } else { FileNameAndParentFrn frn = files[usn.FileReferenceNumber]; if (0 != string.Compare(usn.FileName, frn.Name, true)) { // Log.InfoFormat( // "Attempt to add duplicate file reference number: {0} for file {1}, file from index {2}", // usn.FileReferenceNumber, usn.FileName, frn.Name); throw new Exception(string.Format("Duplicate FRN: {0} for {1}", usn.FileReferenceNumber, usn.FileName)); } } } else { if (!files.ContainsKey(usn.FileReferenceNumber)) { initfiles++; files.Add(usn.FileReferenceNumber, new FileNameAndParentFrn(usn.FileName, usn.FileReferenceNumber)); } else { FileNameAndParentFrn frn = files[usn.FileReferenceNumber]; if (0 != string.Compare(usn.FileName, frn.Name, true)) { // Log.InfoFormat( // "Attempt to add duplicate file reference number: {0} for file {1}, file from index {2}", // usn.FileReferenceNumber, usn.FileName, frn.Name); throw new Exception(string.Format("Duplicate FRN: {0} for {1}", usn.FileReferenceNumber, usn.FileName)); } } } } } pUsnRecord = new IntPtr(pUsnRecord.ToInt32() + usn.RecordLength); outBytesReturned -= usn.RecordLength; } Marshal.WriteInt64(medBuffer, Marshal.ReadInt64(pData, 0)); // if (initfiles > 3000) // break; } Marshal.FreeHGlobal(pData); }